firmware/dmi: Include product_family info to modalias

Some platforms rely on modalias to customize configuration,
the product family helps to identify the hardware.

Add product_family to modalias for better utilization.
This patch mimics commit e26f023e01ef ("firmware/dmi:
Include product_sku info to modalias") that did the same
for product_sku, and commit f97a2103f1a7 ("firmware: dmi:
Move product_sku info to the end of the modalias") that
fixed regressions caused by the added field not being in
the end of the list.

Signed-off-by: Antoine Lassagne <antoine.lassagne@canonical.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>